软产道裂伤多见于（）
A. * * 手术操作不当
B.胎盘植入
C.凝血功能障碍
D.软产道充分扩张
E.产程延长
参考答案：A
A．与
B．H2O 与H2O2
C．O2与O3
D．液氯与氯水
I have steerage way.It is said that（）.
A.I am underway
B.I am out of control
C.I am not making way through the water
D.I have the amout of movement forward which the ship need to be steered properly
与